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Yes, it is possible to add too little mulch. Anything less than 1 inch will likely result in too little coverage around your plants, allowing weeds to grow through and minimizing the positive effects that a deeper bed of mulch would have, like maintaining proper soil moisture and insulating the ground.

Artificial turf usually requires some sort of base. If you’re installing the grass over soil, you’ll want to add a weed barrier (weeds can damage your fake grass) and an artificial grass sub-base . Typically, this is a mixture of gravel and sand, like crushed miscellaneous base (CMB) or decomposed granite. If you're placing turf over concrete, you can skip the sub base and use a padded underlayment.

If you hire a professional landscaper, you could expect to pay between $90 and $660 to install three cubic yards of river rock. (That’s based on the average river rock installation cost of $30 to $220 per cubic yard.) However, the exact price depends on the kind of river rock you choose. Crushed limestone and riprap are some of the more affordable options, while boulders and Arizona river rock are pricier.

There are a few factors to consider when choosing the right size river rock for a landscaping project. First, think about how you’ll use the rocks. For example, if you’re installing them as part of a water feature, medium-sized stones (ranging between 2 and 5 inches) often work best. Smaller rocks (from 1 and 3 inches) are better for walkways and pathways, while a mix of medium and large stones (between 3 and 8 inches) is ideal for garden beds.